21192853500 has 576 divisors, whose sum is σ = 84922306560. Its totient is φ = 4468089600.

The previous prime is 21192853489. The next prime is 21192853523. The reversal of 21192853500 is 535829112.

21192853500 is a `hidden beast` number, since 2 + 11 + 92 + 8 + 53 + 500 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 15969837 + ... + 15971163.

It is an arithmetic number, because the mean of its divisors is an integer number (147434560).

Almost surely, 2^21192853500 is an apocalyptic number.

21192853500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21192853500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42461153280).

21192853500 is an abundant number, since it is smaller than the sum of its proper divisors (63729453060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21192853500 is a wasteful number, since it uses less digits than its factorization.

21192853500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1388 (or 1357 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The spelling of 21192853500 in words is "twenty-one billion, one hundred ninety-two million, eight hundred fifty-three thousand, five hundred".